Just a foot note, Oxygen is non-flammable. It is a catylist though. Oxygen being used in an open bed truck is no danger.
You do need special diffusers for oxygen. Common air stones are far too porous. I almost always run the aerator to eliminate CO2 in the water and oxygen.
stcIAG, You can get a product called PRIME made by SeaChem to treat any water if you like. I prefer clean well or treated tap water over pond water unless filtered very well.
You can lower the temp by using good old ice, again treat it with prime to be safe.
Salt for a small load? again Go to PetSmart and buy some Aquarium salt...it's cheap, or if you can use Stock salt available at any feed store.
Most live haul tanks are well insulated, but for short hauls, anything will work. Just avoid tanks that are dark colored.
Salt is generally only used with very fragile fish or hauls over 8 hours and densely stocked tanks.
The water Foaming can be an issue as well. Pure, Food grade liquid silicone will stop that and is safe for the fish.
You can find the oxygen diffusers and Anti-foam along with dechlorinators at Aquatic Eco Systems website.
